Observation of measurement-induced quantum phases in a trapped-ion quantum computer

• URL: http://arxiv.org/abs/2106.05881v3
• Date: Tue, 19 Oct 2021 22:46:43 GMT
• Title: Observation of measurement-induced quantum phases in a trapped-ion quantum computer
• Authors: Crystal Noel and Pradeep Niroula and Daiwei Zhu and Andrew Risinger and Laird Egan and Debopriyo Biswas and Marko Cetina and Alexey V. Gorshkov and Michael J. Gullans and David A. Huse and Christopher Monroe
• Abstract summary: Many-body open quantum systems balance internal dynamics against decoherence from interactions with an environment. We explore this balance via random quantum circuits implemented on a trapped ion quantum computer. We find convincing evidence of the two phases and show numerically that, with modest system scaling, critical properties of the transition clearly emerge.
• Score: 1.327151508840301
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Many-body open quantum systems balance internal dynamics against decoherence from interactions with an environment. Here, we explore this balance via random quantum circuits implemented on a trapped ion quantum computer, where the system evolution is represented by unitary gates with interspersed projective measurements. As the measurement rate is varied, a purification phase transition is predicted to emerge at a critical point akin to a fault-tolerent threshold. We probe the "pure" phase, where the system is rapidly projected to a deterministic state conditioned on the measurement outcomes, and the "mixed" or "coding" phase, where the initial state becomes partially encoded into a quantum error correcting codespace. We find convincing evidence of the two phases and show numerically that, with modest system scaling, critical properties of the transition clearly emerge.

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